试论焦丁在高炉高比例球团矿治炼中的作用  

Coke Functions in BF Operation while Smelting with High Rate of Pellets

作　　者：贾彬 高冰 李振铠 张海滨 赵月浩 桂鉴侠 JIA Bin;GAO Bing;LI Zhenkai;ZHANG Haibin;ZHAO Yuehao;GUI Jianxia(HBIS Tangsteel Company,Tangshan 063000,Hebei,China)

机构地区：[1]河钢集团唐钢公司,河北唐山063000

出　　处：《炼铁》2024年第3期11-16,共6页Ironmaking

摘　　要：简要分析了高炉高比例球团矿治炼的难点,认为可通过矿焦混装技术来改善冶炼效果,并可适当提高焦丁人炉比例,将焦丁粒度下限调整为6~8mm。重点分析了焦丁在高炉冶炼中的作用,主要包括:①矿焦混装可限制球团矿滚动,稳定料面形状,焦丁比大于60kg/t时,焦丁对球团矿滚动的限制效果明显变强;②降低焦丁平均粒度,与矿石粒度相近,改善块状带透气性;③由于焦丁的存在,铁橄榄石相的生成量受到抑制,且在1050℃下能够被碳直接还原,避免了球团矿表面形成致密的金属铁壳,其还原性能得到改善;④加大焦丁量能进一步改善炉料的软化和熔滴性能,有利于缓解高球比冶炼时软熔带透气性差的问题。The tough points of BF operation while smelting with high rate of pellets are analyzed.It is suggested to improve the smelting performance by means of the mixing charging of ore and coke,increasing the rate of coke nut in the charge,and adjusting the lower limit of coke nut particle size to 6-8 mm.The analysis focuses on the functions of coke nut in BF smel-ting:(1)mixing charging of ore and coke can restrain the rolling of pellets and stabilize the stockline surface;when the coke nut rate is greater than 60kg/t,the restraining effect of coke on pellet rolling becomes significant;(2)if average particle size of coke is reduced to the one similar to the ore,the furnace permeability at lumpy ore zone is improved;(3)coke nut can suppress the formation of olivine phase,and it can be directly reduced by carbon at 1050℃,preventing the formation of dense metal iron crust on the pellet surface,and improving the pellet reduction performance;(4)higher rate of coke nut can further improve the softening and dripping behavior of the charge,which is conducive to alleviating the deterioration of the permeability at the cohesive zone while smelting under high rate of pellets.

关 键 词：高炉 球团矿 焦丁比 矿焦混装 软熔性能 透气性 

分 类 号：TF53[冶金工程—钢铁冶金]